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authorRoland McGrath <roland@redhat.com>2005-10-30 15:02:50 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:24 -0800
commit7f2a52555998c699a7e89f24636c909d6fc08a60 (patch)
tree98ef1254ab3e727ba3470d4eeaf064d5dcb48614 /lib
parent396dc44bcac58f464b7b23c345052e37881cccea (diff)
downloadop-kernel-dev-7f2a52555998c699a7e89f24636c909d6fc08a60.zip
op-kernel-dev-7f2a52555998c699a7e89f24636c909d6fc08a60.tar.gz
[PATCH] wait4 PTRACE_ATTACH race fix
Back about a year ago when I last fiddled heavily with the do_wait code, I was thinking too hard about the wrong thing and I now think I introduced a bug whose inverse thought I was fixing. Apparently noone was looking too hard over much shoulder, so as to cite my bogus reasoning at the time. In the race condition when PTRACE_ATTACH is about to steal a child and then the child hits a tracing event (what my_ptrace_child checks for), the real parent does need to set its flag noting it has some eligible live children. Otherwise a spurious ECHILD error is possible, since the child in question is not yet on the ptrace_children list. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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